The Audio Engineering Society 16th International Conference: Spatial Sound Reproduction, 10-12 April 1999


Sound Moving Control for Home Theater Applications

1) Sergey Novikov, 2) Sergey Grigoriev, 3) Dmitry Elyashev

1) Russian Ac. Sci. Institute of Informatics Problems, Moscow, Russia

2) Russian Ac. Sci. State Oceanology Institute, Moscow, Russia

3) Film Director, Producer, Moscow, Russia

Fast algorithms for accurate sound localization in space are proposed. They are based on approximation of summary sound spectrum, obtained from 5 speakers, to one which must be percepted from virtual source placed at given point in space. The appropriate software allows to avoid using of an expensive hardware, the same accuracy being provided. The proposed virtual source simulation algorithm is based on the following assumptions: a) a considerably narrow frequency band can be locally represented by a single sine function; b) the third component (height) of the virtual sound source is defined by reflection and some other spectral features that are intrinsic to initial signal. Monte-Carlo method was used to get regularized solution. We developed compact software that allow to make complete calculations for the whole 40 sqr.m. grid with 12 cm. step in 0.2-1.5 min. on Pentium II, depending on accuracy. After these short preliminary calculations, any path or localization of sound can be defined in real play time on Pentium II, final construction taking 0.2-1 min. for 10 sec. of sounding. The input data for this software is a standard mono WAV-file with 44100 smpl/sec, and output are 5 WAV-files which could be played simultaneously on 5 speakers. For this purpose we used GINA sound card (ECHO Corp.). The proposed method was specially designed and applied for certain art projects (video and music), we assume to demonstrate the corresponding results.

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Last modified: 12.03.1999